Bosh-plate for furnaces



No. 6l5,456. Patented Dec. 6, |898.

E. KEBR.

BUSH PLATE FDR FUBNACES.

(Application filed Mar. 4, 1898A No ModeU FIC-3.21.

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UNITED STATES PATENT EEICE.

EDWARD KERR, OF PITTSBURG, PENNSYLVANIA.

BOSH-PLATE FOR FU RNACES.

SPECIFICATIGN forming part of Letters Patent No. 615,456, dated December6, 1898.

Y Application led March 4, 1898. Serial No. 672,519. (No model.)

To all whom t mld/y concern: j

Beit known that I, EDWARD KERR, a citizen of the United States, residingat Pittsburg, in the county of Allegheny and State of Penn- Sylvania,have invented or discovered certain new and useful Improvements inBosh-Plates for Furnaces, of which improvements the following is aspecification.

The invention described herein relates to certain improvements inbosh-plates for blastfurnaces. These plates, which are incorporated inthe Walls of a blast-furnace in order to protect the bosh portionthereof, are generally made of such an external contour as to requirespecial shapes of bricks to form the recesses for their reception7thereby adding considerably to the cost of erection and repairs.

It frequently happens in the operation of blast-furnaces that an arch isformed across the furnace, preventing down movement of the charge. Insuch cases resort must be had to a blowpipe to melt down the arch or thelatter is broken down by blasting. In either case one or more holes mustbe formed through the wall of the furnace. As the arch usually occursalong or adjacent to the bosh portion of the furnace, one or moreof thebosh-plates are removed and a hole punched through the furnace-liningback of the boshplates. The removal of the bosh-plates necessitates abreak in the system of pipes connecting the plates with the water-supplyand provision to be made for maintaining a supply of water to the platesnot removed in order to prevent their injury by the heat of the walls.

The object of the present invention is to provide a bosh-plate of suchshape that the recesses therefor may be formed of brick of the usualshape.

It is also an object of the invention to provide a bosh plate with anopening therethrough, so as to permit of the forming of an openingthrough the interior wall of the furnace and the insertion of a blowpipeor explosive charge Without removing any of the plates.

The invention is hereinafter more fully described and claimed.

In the accompanying drawings, forming a part of this specification,Figure l is a sectional plan view of my improved bosh-plate. Fig. 2 isan end elevation of the same; and Fig. 3 is a sectional elevation, theplane of section being indicated by the line III III,

Fig. 1.

In my improved bosh-plate the Walls l l and'2 2, forming the upper andlower sides, are made plane orat and are arranged at an angle to eachother, the lines of junction of said plates lying in or approximately ina plane passing through the axis of the boshplate.v The sides l. 2 andla 2n on each side of the linesof junction are inclined toward eachother, as clearly shown in Fig. 2, and their outer edges connect withthe vertical walls 3. As shown in Fig. 1, the outer ends of the upperand lower sides are wider than the inner ends, so that the verticalwalls 3 are inclined toward each other. By reference to Fig. 3 it willbe seen that the upper and lower sides incline toward each other fromthe outer toward the inner end of the boshplate. Within this externalshell is formed a ilattened frusto-conical shell or tube 4, whose endsconnect and form a tight joint with the end walls, through which areformed openings corresponding with the open ends of the shell or tube.

A tube 5 is inserted or formed between the inner and outer shells andextends nearly to the rear end of the bosh-plate, as shown in Figs. 1and 3. The outer end of this tube projects sufficiently far to permit ofa watersupply pipe being attached thereto. VThe water escapes from thebosh-plate through the nozzle 6, which is connected to any suitableWaste-pipe.

It is characteristic of my improved boshplate that all of its sides havean inclination from the outer toward its inner end and that the upperand lower sides incline toward each other from the middle of thebosh-plate. As all the sides of the bosh-plate are made plane or flat,the recesses formed in the walls of the furnace for their reception canbe formed of the ordinary shape of brick. The sides of bosh-plate beinginclined fromv the outer to the inner end, it would be nearlyTimpossible to wedge it in the recess in the furnace-wall.

The opening or passage through the bosh= IOO plate permits of theinsertion of tools to break an opening through the inner wall of thefurnace for the insertion of a blowpipe or explosive charge to breakdown any archformed in the furnace. After the arch has been broken downand the furnace resumed normal operation material can be passed throughthe opening for closing the opening in the inner wall of the furnace.

By reason of the inclination of the bottom walls 2 2a toward the outerend of the boshplate and also toward a vertical median plane passinglongitudinally through the bosh-plate all dirt and sediment will collectnear the outer end of the bosh-plate and alongside of the inlet pipe orpassage 5. The sediment thus collected can be blown out through twoopenings formed in the outer end of the boshplate on opposite sides ofand adjacent to the inlet-passage. These openings are normally closed byscrew-plugs 7. This construction will prevent the sediment fromcollecting at the inner ends or otherhighly-heated portions of the bosh.

I am aware that twyer boxes or plates have been formed with openingstherethrough for the reception of the twyers; but bosh-plates, which areused for entirely different and distinct purposes, have heretofore beenso constructed as to preclude any inspection of or operation on theWalls of the furnace or its charge in line with any of the bosh-plateswithout the bodily removal of such plates.

I claim herein as my inventionl. A bosh-plate for furnaces having itsbottom walls inclined from'the outer to the inner end of the bosh-plateand from the edges toward a vertical plane passing through the aXis ofthe bosh-plate, substantially as set forth.

2. A bosh-plate for furnaces having all of its Walls made plane or fiatand inclined from the outer to the inner end of the bosh-plate, and theupper and lower sides inclined toward each other from avertical planepassing through the axis of the bosh-plate, substantially as set forth.

3. A bosh-plate for furnaces having an opening extending axiallytherethrough, substantially as set forth.

.4. A bosh-plate consisting of inner and outer walls, forming betweenthem a chamber for the reception of a cooling fluid, the inner wallsconstructed to form a passage or opening extending longitudinallythrough the bosh-plate, substantially7 as set forth.

In testimony whereof I have hereunto set my hand.

EDWARD KERR.

Witnesses:

F. E. GAITHER, DARWIN S. XVoLCoT'r.

